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http status code

411 Length Required

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The HTTP 411 Length Required client error response status code indicates that the server refused to accept the request without a defined Content-Length header.

[!NOTE] When sending data in a series of chunks, the Content-Length header is omitted, and at the beginning of each chunk, the length of the current chunk needs to be included in hexadecimal format. See Transfer-Encoding for more details.

Status

411 Length Required

Examples

Chunked POST request

The following request is sent chunked, which is the default method of sending data in some cases, such as when writing to streams:

POST /translate/de HTTP/1.1
Host: api.example.com
Content-Type: application/json
Transfer-encoding: chunked

2C
{"text": "Hurry up, Ayşe is hungry!"}
0

In this case, the server is expecting a request in one part with a Content-Length header and returns a 411 response:

HTTP/1.1 411 Length Required
Content-Type: application/json
Content-Length: 110

{
  "message": "Requests must have a content length header.",
  "documentation": "http://api/example.com/docs/errors",
}

Specifications

SpecificationsStandards references are available on the canonical MDN page.

See also